I have never had the chance for a dealer to service my tractor. Now that I have this new Kubota, bought from a dealer that does not have a problem with pickup and delivery, it may be a different tune, but I doubt it. I always looked at it this way: Hot oils drain better. I can drain after working the machine for a couple of hours. The dealer will drain cold oil. I also can leave the drain plugs out longer. The dealer is (I am assuming) not going to wait an hour put the drain plug back. That 'drip time' contains some of the heavy elements that detergents cannot keep in suspension and I like to think I am leaving less behind to contaminate the new oil that will spend the next hundred hours or more in my engine (and Hydro) I do not think a dealer would go so far as to use the wrong fluids intentionally, or cheap substitutes, However I ALWAYS check ALL fluid levels when one of our cars come back from service. About one out of 3 times I find that fluid levels are off the mark, sometimes alot, and over-full as often as under-filled. By the time I get that straightened out, I find little advantage to someone else doing the service. Lubrication is the "kid" job and often is not supervised, do not assume the best mechanic on the line is doing it, unless he is the only one in the shop. What it boils down to is that I usually enjoy servicing my equipment, I get a chance to inspect the machine closer and sometimes catch loose, missing or broken part before they become a problem. I never have that nagging doubt about the pedigree of the lifeblood in my machine. If a dealer serviced my tractor, at the very least, I would double check the fluid levels before and after operating the first time, also I would not fail to put a wrench on the drain plugs to make sure they are snug. This may sound paranoid, but even the best mechanic can be distracted several times during a service, and it is easy enough to over look one of several drainplugs.